code: def to_dict(self):
      return dict(
          element_type=str(self.element_type),
          shape=self.shape,
          is_row_vector=self.is_row_vector,
          block_size=self.block_size,
      )
  
file_path: hail/hail/python/hail/expr/blockmatrix_type.py
imports: import pprint
  from hail.typecheck import typecheck_method, sequenceof
  from hail.utils.java import jiterable_to_list
  from hail.expr.types import dtype, hail_type
label_desc: Use image node_id 4 for calling the tblockmatrix obj's underlying member method code with example usage: obj.to_dict() and returns: dict